Direct measurement of A(b) in Z0 decays using charged kaon tagging

We present a direct measurement of the parity-violating asymmetry Ab in the Z0 to bb¯ coupling using a new technique to distinguish the b and b¯ quarks using charged kaons from B decays. The Z0 bosons are produced in e+e− collisions at the SLC with longitudinally polarized electrons. bb¯ events are selected using a secondary vertex mass tag and Ab is determined from the left-right forward-backward asymmetry. From the 1994–1995 data sample, selected from 100 000 hadronic Z0 decays, we obtain Ab=0.855±0.088stat±0.102syst.

electron positron: colliding beams
electron positron: annihilation
electron: polarized beam
Z0: electroproduction
Z0: hadronic decay
bottom: pair production
angular distribution: asymmetry
polarization: asymmetry
particle identification: flavor
B: decay

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Figures(0)

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